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authorGuoqing Jiang <gqjiang@suse.com>2015-12-21 00:51:00 +0100
committerNeilBrown <neilb@suse.com>2016-01-06 01:39:10 +0100
commit15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8 (patch)
treee44bdb5eba07e589d43ef66725d3d0dfa45c4f4d /drivers/md/md.h
parentmd-cluster: update the documentation (diff)
downloadlinux-15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8.tar.xz
linux-15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8.zip
md-cluster: Defer MD reloading to mddev->thread
Reloading of superblock must be performed under reconfig_mutex. However, this cannot be done with md_reload_sb because it would deadlock with the message DLM lock. So, we defer it in md_check_recovery() which is executed by mddev->thread. This introduces a new flag, MD_RELOAD_SB, which if set, will reload the superblock. And good_device_nr is also added to 'struct mddev' which is used to get the num of the good device within cluster raid. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index f7b17aef837d..8817e623258a 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -235,6 +235,9 @@ struct mddev {
*/
#define MD_JOURNAL_CLEAN 5 /* A raid with journal is already clean */
#define MD_HAS_JOURNAL 6 /* The raid array has journal feature set */
+#define MD_RELOAD_SB 7 /* Reload the superblock because another node
+ * updated it.
+ */
int suspended;
atomic_t active_io;
@@ -465,6 +468,7 @@ struct mddev {
struct work_struct event_work; /* used by dm to report failure event */
void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
struct md_cluster_info *cluster_info;
+ unsigned int good_device_nr; /* good device num within cluster raid */
};
static inline int __must_check mddev_lock(struct mddev *mddev)